Gone are the days of Internet Explorer, which was Windows OS's iconic web browser since its earliest days, Though Microsoft hasn't completely dumped its IE but it has introduced its latest 'Project Spartan' web browser in its technical preview version of Windows 10. Aimed to provide better web experience and to fit well with the modern internet systems, Spartan overtook and corrected all those minute details and flaws which made IE subject to such massive scrutiny.
Internet Explorer 11 still stays as the default web browser in Windows 10 devices but it is now accompanied by Spartan, which will work and run alongside. The rendering engine will be similar to the desktop version of it and Cortana, Microsoft's AI will be able to populate the Spartan's search screen with its own custom searches and data based on the user. it does seem impressive to have Cortana integrated with Spartan. In addition to that, Spartan also has a new 'reading mode' like the one seen in Safari. It will pull all the necessary texts out from the web page and display it in a beautiful easy-to-read format, just like Pocket or Instapaper and sync the webpages across all your Windows devices.

( Source : cnet )

"Spartan has the same new rendering engine available on the desktop, with the same support for the latest standards and strong focus on inter-operability with the modern web" - Kyle Pflug ( Manager of Project Spartan Program )

It is not only the Web browser which has been revamped but also other apps by Microsoft, including Calendar, Mail, Messaging, People and others. This Update is currently only available to Microsoft Insider members but you may expect it soon to be in your devices as well.